oprah winfrey and champion biker lance armstrong. more than three million people watched trying to gauge his confession, his remorse. neal karlinsky studied armstrong's answers and we wondered, did he finally tell the truth? >> reporter: if lance armstrong's goal in talking with oprah was a shot at redemption, he may have just taken a big step backwards. >> i view this situation as one big lie that i repeated a lot of times. >> reporter: but federal investigators say, even now, he's still lying. one of the biggest, armstrong told oprah he stopped doping in 2005. >> you did not do a blood transfusion -- >> absolutely not. >> -- in 2009? you did no doping or blood transfusions in 2010? >> absolutely not. 2009 and 2010, those were the two years i did the tour. absolutely not. >> reporter: yet today investigators tell abc news that armstrong's bloodwork from his 2009 tour de france shows clear blood manipulation consistent with banned transfusions. so why admit to some doping but not all? investigators say it's to keep within the statute